Burglar-proof grating.



No. 759,471. PATBNTED MAY 10, 1904.

H. RICK. B URGLAR PROOF GRATING.

APPLICATION FILED JAN. 21. 1903.

N0 MODEL.

UNITED STATES Patented May 10, 1904.

HEINRICH RICK, OF GODESBERG, GERMANY.

BURGLAR-PROOF GRATING.

SPECIFICATION forming part of Letters Patent No. 759,471, dated May 10,1904.

Application filed January 21, 1903. Serial No. 140,051. (No model.)

To all whom it Ina/y concern:

Be it known that I, HEINRICH RICK, a subject of the German Emperor,residing at Godesberg, Germany, have invented certain new and usefulImprovements in Burglar-Proof Grat ings, of which the following is aspecification.

The subject of the presentinvention is a burglar-proof gratingforwindows, doors, banks, prisons, &c. The essential feature of theinvention is that the individual bars of the grating are made of steeltubing and are let into the iron forming the top and bottom of thegrating. Within these steel tubes and likewise let into the iron at thetop and bottom of the grating are steel rods which, however, have acertain amount of play within the tubes and are so arranged that theycan easily rotate. In consequence of this arrangement it is impossiblefor such a grating to be filed through.

The invention is illustrated in the accompanying drawings, in Whicl1-Figure 1 is a longitudinal section through one portion of the grating;and Fig. 2 is a crosssection on the line A B, Fig. 1.

The grating-bars a, made of steel tubing, are let into the iron bars 0and d. Within the steel tubes at are the steel rods 5, which arelikewise let into the iron bars cand cl, in such a way, however, thatthey can easily rotate. If now the steel tubes a are tiled through andthe inner rods 1) attacked, they will move round and round under theaction of the file,

and consequently it is absolutely impossible to file them through.

It should be pointed out that this grating is not merely applicable towindows and doors, but also renders impossible breaking in through thefloor, as also through the sides or ceiling of the room. Accordingly aroom which is provided throughout with this device is completelyprotected against any one breaking in or out.

The device can lie hidden when used for walls and ceilings.

The supports 9, in which the movable steel rods rest, should be made ofgood rust-proof metal, such as copper or brass, which offers to themovable rods an easier and better bearing and insures free rotation ofthe rods.

If when of great length a bending of the outer tubes is to be feared,this disadvantage may beovercome by intermediate cross-bars.

VVhat I claim, and desire to secure by Letters Patent of the UnitedStates, is

A burglar-proof grating comprising rotatable rods, tubular barsinclosing the rods, and bearings for the rods and in which the rods arerotatable, said bearings being of a rustproof material.

In testimony whereof I have hereunto set my hand in the presence of twowitnesses.

HEINRICH RICK.

Witnesses:

W'. FREITIERR VON LYNOKEER, CARL SoIIMIT'r.

